Probably the biggest issue is the wheel chair. FT is typically shot over rough ground. Although it's not meant to be an assault course, having had experience of working with a couple of shooters in chairs, I would say that perhaps a visit to the ground first may be in order to assess what access you have.
Another thought that's popped in my head is that the muzzle, by the rules, has to be over the line. I'm unsure how you shoot so cannot comment, but it's something to bear in mind. If a rifle is particularly short then it may cause issues in that respect, but I'd say no.1 issue is getting over the ground.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep